Stanislaus County, CA Accessory Structures: Tiny Homes (2026)

Unincorporated Stanislaus County does not have a dedicated tiny-home ordinance, so tiny dwellings are regulated through existing Title 21 categories. A small permanent house built on a foundation is treated as an accessory dwelling unit (ADU) under Chapter 21.74, which permits units up to 1,200 square feet of living space (well above tiny-house sizes) and up to 500 square feet for a junior ADU; these are allowed in R-1, R-2, R-3, R-A, A-2 and residential P-D zones with ministerial approval, four-foot side/rear setbacks, and a recorded covenant (21.74.030, 21.74.040, 21.74.050). A 'tiny home on wheels' is generally a recreational vehicle, and Section 21.12.505 of the Zoning Ordinance states that 'the use of a recreational vehicle for human habitation shall not be permitted in any zoning district,' so it cannot serve as a permanent residence on a parcel. The ordinance does allow a mobile home to be used in lieu of a detached ADU if it meets the eligibility and compatibility criteria of Chapter 21.72 and the standards of Chapter 21.74 (Section 21.74.030(D)). Because there is no tiny-home-specific code, the path to a legal tiny dwelling is to build to the California Building Code as an ADU/JADU or to place a qualifying manufactured/mobile home under Chapters 21.72 and 21.74. Owners should confirm the route with the Planning Department before purchasing or building.